US3295417A - Apparatus for cutting optical elements - Google Patents

Apparatus for cutting optical elements Download PDF

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Publication number
US3295417A
US3295417A US493739A US49373965A US3295417A US 3295417 A US3295417 A US 3295417A US 493739 A US493739 A US 493739A US 49373965 A US49373965 A US 49373965A US 3295417 A US3295417 A US 3295417A
Authority
US
United States
Prior art keywords
cutter
spindle
spindle assembly
assembly
blanks
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US493739A
Other languages
English (en)
Inventor
Albert J Hanlon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Polaroid Corp
Original Assignee
Polaroid Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Polaroid Corp filed Critical Polaroid Corp
Priority to US493739A priority Critical patent/US3295417A/en
Priority to DE1966J0031933 priority patent/DE1629476B2/de
Priority to FR79055A priority patent/FR1495995A/fr
Priority to GB44740/66A priority patent/GB1150754A/en
Priority to NL666614146A priority patent/NL145165B/xx
Application granted granted Critical
Publication of US3295417A publication Critical patent/US3295417A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q35/00—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually
    • B23Q35/04—Control systems or devices for copying directly from a pattern or a master model; Devices for use in copying manually using a feeler or the like travelling along the outline of the pattern, model or drawing; Feelers, patterns, or models therefor
    • B23Q35/08—Means for transforming movement of the feeler or the like into feed movement of tool or work
    • B23Q35/10—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only
    • B23Q35/101—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only with a pattern composed of one or more lines used simultaneously for one tool
    • B23Q35/102—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only with a pattern composed of one or more lines used simultaneously for one tool of one line
    • B23Q35/104—Means for transforming movement of the feeler or the like into feed movement of tool or work mechanically only with a pattern composed of one or more lines used simultaneously for one tool of one line with coaxial tool and feeler
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30084—Milling with regulation of operation by templet, card, or other replaceable information supply
    • Y10T409/301176—Reproducing means
    • Y10T409/301624—Duplicating means
    • Y10T409/302576—Duplicating means with means to support templet above or under work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30084—Milling with regulation of operation by templet, card, or other replaceable information supply
    • Y10T409/302968—Milling with regulation of operation by templet, card, or other replaceable information supply including means for operation without manual intervention
    • Y10T409/303248—Milling with regulation of operation by templet, card, or other replaceable information supply including means for operation without manual intervention with provision for circumferential relative movement of cutter and work

Definitions

  • Cutting apparatus of the type with which this invention is concerned should have certain desirable characteristics.
  • One of these characteristics is that the spindle assembly on which the blanks of optical material to be out are held should not be rotating as the cutter and the blanks come into engagement. The reason for this is that the spindle rotates in the direction opposed to that of the cutter and overloading of the cutter drive motor at the time of engagement or clogging of the cutter otherwise is apt to occur. It is another desirable characteristic of such apparatus that the spindle assembly should begin to turn at the instant the blanks engage the cutter. This prevents the cutter from dwelling in one spot on the blanks too long with the possibility of overheating the blanks.
  • the invention accordingly comprises the apparatus possessing the construction, combination of elements and arrangement of parts which are exemplified in the following detailed disclosure, and the scope of the application of which will be indicated in the claims.
  • FIGURE 1 is a perspective view of the apparatus embodying the invention
  • FIG. .2 is a partial perspective view of the spindle assembly and a portion of the cutter assembly, showing the cutter cutting optical elements from a stack of blanks;
  • FIG. 3 is a partial side view of a portion of the spindle assembly, illustrating theconfiguration of a blank and the configurations of the clamping surfaces of upper and lower clamping blocks;
  • FIG. 4 is a partial section view taken on lines 44 in FIG. 3;
  • FIG. 5 is a diagrammatic illustration of the arrangement for driving the spindle assembly and for rotating the head assembly
  • FIG. 6 is a top view of the apparatus embodying the invention, a portion of the housing for the head assembly being broken away to show certain internal components;
  • FIG. 7 is a section view taken on lines 7-7 in FIG. 5.
  • FIGURE 1 illustrates one possible embodiment of the invention. Referring to these drawings, and particularly to FIGURE 1, the illustrated embodiment will be seen to comprise a base 10 supporting a head assembly 12 and a cutter assembly 14.
  • the head assembly 12 includes a housing 16 having a recess 18 within which the cutting operation takes place and a spindle assembly 20 functioning to securely hold one or a stack of blanks 22 during the cutting operation.
  • the spindle assembly 20 comprises a rotatable upper shaft 24 and a rotatable lower shaft 26.
  • the upper shaft 24 supports an upper clamping block 28 which engages the uppermost blank in a stack of blanks; the shaft 24 also supports a cam 30 having the profile which it is desired that the cut optical elements have.
  • the clamping block 28 and the cam 30 are secured upon the upper shaft 24 by a collar 34.
  • the lower shaft 26 supports a base member 35, which in turn mounts a lower clamping block 36.
  • the clamping blocks 28, 36 are formed from a material having a coefficient of friction great enough to prevent slippage of the blanks 22 when clamped between the clamping blocks 28, 36.
  • One ma terial which has been found to be suitable for this purpose is Bakelite.
  • the clamping blocks 28, 36 have mating convex and concave clamping surfaces 37, 38, respectively.
  • the configurations of thesurfaces 37, 38 conform to the surfaces of a blank 22.
  • the illustrated blank 22 is a blank from which a sunglass lens may be cut; however, various other configurations and applications are within the contemplation of the invention.
  • the lower clamping block 36 has a central recessed portion 39.
  • the clamping surface 38 on the lower clamping block 36 consists of the marginal area around the recessed portion 39. This arrangement minimizes the possibility of having dirt, scrap or any other irregularity in the configuration of the clamping surfaces 37, 38 act as a pivot which might allow relative angular movement to occur between the upper clamping block 28 and lower clamping block 36.
  • clamping blocks 28, 36 and the cam 30 are made easily interchangeable with other sets of clamping blocks and cams having different profiles,
  • the alignment member 42 has a pair of mutually perpendicular vertical aligning surfaces 46, 4 8 which facilitate alignment of a rectangular blank between the clamping blocks 23, 36.
  • means may be provided with which the alignment member 42 can be adjusted in a plane perpendicular to the axis of the spindle assembly 28; however, for clarity of illustration, such means has not been shown.
  • Means are provided, but not shown, by which the alignment member 42 is drawn out of the way after the blanks 22 have been clamped between the clamping blocks 28, 36. These means are necessary in order to prevent the alignment member 42 from interfering with the rotation of the blanks 22 during a cutting operation.
  • clamping motive means 50 are provided in the head assembly 12 for axially moving the upper shaft 24 and thus the upper clamping block 28 with respect to the lower shaft 26 and lower clamping block 36.
  • the clamping motive means 58 is illustrated diagrammatically in FIG. 5.
  • the clamping motive means would preferably comprise a hydraulically driven cylinder on the upper shaft 26; however, manualor other powered means would be suitable.
  • the cutting function is accomplished by a cutter 52 comprising a part of the cutter assembly 14.
  • the cutter 52 may be a shell end mill cutter or any other suitable cutter.
  • the cutter 52 is mounted upon a cutter drive shaft 54 supported in a cutter mount 56.
  • the cutter drive shaft 54 is driven by cutter drive motor, illustrated diagrammatically in FIG. 2 at 52.
  • a slide 60 reciprocably mounted upon the cutter mount 56 carries a cam follower in the form of a roller 62 rotatably mounted upon a pin 64.
  • a screw 66 operating on the slide 60 provides means for adjusting the position of the roller 62 along a radial line from the axis of the spindle assembly 20. By varying the position of the roller 62, the size of the optical elements cut by the cutter 52 can be finely adjusted, as will be described in more detail hereinafter.
  • a spur gear 72 which meshes with an idler gear 74 which in turn drives a spur gear 76 on lower shaft 26.
  • a similar gear train drives the upper shaft 24spu-r gear 78 meshes with idler gear '80 which drives spur gear 82 on the upper shaft 24.
  • a driving connection is effected between the input shaft 70 and the housing 16 through a friction clutch 84.
  • a heavy duty friction clutch 85 is interposed in the input shaft between the drive motor 68 and the spur gear 72. The clutch 85 is capable of transmitting greater maximum torque than clutch 84.
  • one toothed ratchet wheel 87 and pawl 89 provide means for indexing the spindle assembly 20.
  • control apparatus 86 controls the actuation of the clamping motive means 50, the means (not shown) employed for retracting the alignment member 42, the cutter drive motor 58, and the drive motor 68.
  • a cycle of operation of the apparatus is completely automatic after a stack of blanks 22 has been manually located on the lower clamping block 36. Theoperation thereafter is described below.
  • Closing of a starting switch first causes the .cutter drive motor 58 and the clamping motive means 50 to' be energized.
  • Energization of the motive means 50 causes the upper clamping block 28 to be driven downward from a raised position (see FIGS. 1 and 3) into clamping engagement with'a stack of blanks 22 (see FIGS. 2 and 5).
  • FIG. 5 as the clamping motive means 50 drives the upper clamping block 38 downward, the upper shaft 24 moves through the spur gear 82; the spur gear 82 does not move out of 4 input shaft 70 in the clockwise direction (in FIG. 6).
  • Friction clutch 84 couples the drive from the input shaft 70 directly to the housing 16, causing the housing 16 and the entire head assembly 12 .to be rotated clockwise away from the rest position toward the cutter assembly 14 (see FIG. 6). At this time the friction clutch 84 has not yet begun to slip, hence no rotary drive is yet imparted to the spindle assembly 20. However, the" instant the stack of blanks 22 engage the rotating cutter 52, friction clutch 84 is no longer able” to withstand the torque imposed upon it by the drive'motor 68 through the input shaft 70, and it begins to slip.
  • timing means comprising a part of the control apparatus '86 causes a reversal in the polarity of the electrical supply to the reversible drive motor 68.
  • the friction clutch 84 transmits the torque on 1 the input shaft 70 to the housing 16, thus causing the head assembly '12 to be rotated in the counterclockwise direction away from the cutter assembly 14.
  • the time delay imposed by the delay switch is sufiiciently long to insure thatthe drive motor 68 is able to drive the spindle assembly 20 to its index position before being de-energized.
  • the heavy 'duty friction clutch is provided.
  • the heavy; duty clutch 85 can transmit higher maximum torque than clutch 84 so that clutch 84, rather than heavy duty clutch 85, will slip when the blanks 22 engage the cutter 52 during a cycle of operation.
  • Means within the control apparatus 86 automatically cause the clamping motive means 50 to raise the upper clamping block 28 and to thus free the cut optical elements for manual removal by the operator.
  • the alignment member 42 is automatically returned to its rest position wherein it is positioned to assist in aligning the blanks to be cut in the succeeding cutting operation.
  • the apparatus might be constructed such that the cutter assembly moves into engagement with the blanks to be cut, rather than having the head assembly, including the spindle assembly, move the blanks into engagement with the cutter.
  • Manual means other than a screw arrangement could be employed to adjust the position of the cam follower with respect to the cutter for making fine adjustments in the size of the finished optical element cut by the cutter.
  • the means mounting the cam follower might be made automatically adjustable and the cutter could be programmed to make two complete cuts during the operating cycle, rather than one.
  • Apparatus for cutting from blanks of synthetic optical material optical elements having a predetermined profile comprising:
  • a head assembly including:
  • spindle assembly assuming an index position at rest, said spindle assembly including means for securely holding a blank
  • spindle drive means for rotating said spindle assembly
  • spindle coupling means for effecting a driving connection between said spindle assembly and said spindle drive means
  • a cutter assembly including:
  • spindle coupling means comprises:
  • said motive means comprises:
  • control means for effecting a reversal of said spindle drive means after said spindle assembly has been rotated through a complete revolution plus an additional displacement sutficient to insure the complete removal of scrap from the blank by said cutter, said head assembly being rotated away from said cutter against stop means defining said rest position, the engagement of said head assembly with said stop means causing said friction clutch to slip and said spindle drive means to drive said spindle assembly to said index position.
  • Apparatus for cutting from blanks of synthetic optical material optical elements having a predetermined profile comprising:
  • a head assembly including:
  • a housing; a spindle assembly comprising:
  • a cutter assembly comprising:
  • said second motive means comprises:
  • said spindle drive means said input shaft; and a friction clutch between said input shaft and said housing, whereby a rotational input on said input shaft efiects a rotation of said head assembly from a rest position until engagement of a blank with said cutter prevents further rotation of said head assembly, said engagement causing friction clutch to slip and said spindle drive means to drive said spindle assembly through said gear train.
  • control means for effecting a reversal of said spindle drive means after, said spindle assembly has been rotated through a' complete revolution plus an additional displacement sufficient to insure the complete removal of scrap from 5 and said spindle drive means to drive said spindle assembly 10 to said index position.
  • a second friction clutch interposed in said input shaft 15 for preventing damage to said motor when said spindle vis stopped at said index position 'by said indexing means, said second friction clutch being constructed and arranged to transmit greater maximum torque than said friction clutch betweensaid input shaft and said housing.
  • the apparatus defined by claim 7 including alignment'means mounted in a predetermined spaced relationship with said clamping blocks for facilitating proper alignment of a .blank in said blocks, said alignment means including two vertical, mutually perpendicular aligning surfaces.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Automation & Control Theory (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Control Of Cutting Processes (AREA)
US493739A 1965-10-07 1965-10-07 Apparatus for cutting optical elements Expired - Lifetime US3295417A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US493739A US3295417A (en) 1965-10-07 1965-10-07 Apparatus for cutting optical elements
DE1966J0031933 DE1629476B2 (de) 1965-10-07 1966-10-05 Vorrichtung zur spanabhebenden bearbeitung des randes von kunststoffrohlingen optischer elemente
FR79055A FR1495995A (fr) 1965-10-07 1966-10-06 Appareil perfectionné destiné à la taille d'éléments optiques
GB44740/66A GB1150754A (en) 1965-10-07 1966-10-06 Improvements relating to Apparatus for Cutting Optical Elements
NL666614146A NL145165B (nl) 1965-10-07 1966-10-07 Inrichting voor het met een draaiend gereedschap bewerken van de rand van ten minste een lens van optisch materiaal.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US493739A US3295417A (en) 1965-10-07 1965-10-07 Apparatus for cutting optical elements

Publications (1)

Publication Number Publication Date
US3295417A true US3295417A (en) 1967-01-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
US493739A Expired - Lifetime US3295417A (en) 1965-10-07 1965-10-07 Apparatus for cutting optical elements

Country Status (5)

Country Link
US (1) US3295417A (de)
DE (1) DE1629476B2 (de)
FR (1) FR1495995A (de)
GB (1) GB1150754A (de)
NL (1) NL145165B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145516A2 (de) * 1983-09-19 1985-06-19 Polymatic Investment Corporation N.V. Schneidvorrichtung und Verfahren zum genauen Abgraten der Kante einer gegossenen Kontaktlinse
US5345984A (en) * 1993-12-10 1994-09-13 Ardesson William A Pin router apparatus
US20120207561A1 (en) * 2011-02-14 2012-08-16 Samsung Electronics Co., Ltd. Router apparatus
US20120325061A1 (en) * 2011-06-24 2012-12-27 Hon Hai Precision Industry Co., Ltd. Machining device
US11358250B2 (en) * 2016-07-08 2022-06-14 Kojima Engineering Co., Ltd. Spherical lens surface processing method and spherical lens surface processing apparatus with cup-shaped grinding stone

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2481634A1 (fr) * 1980-04-30 1981-11-06 Briot Internal Dispositif de serrage pour machine a meuler et/ou biseauter des verres de lunettes; machine equipee de ce dispositif

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145516A2 (de) * 1983-09-19 1985-06-19 Polymatic Investment Corporation N.V. Schneidvorrichtung und Verfahren zum genauen Abgraten der Kante einer gegossenen Kontaktlinse
EP0145516A3 (en) * 1983-09-19 1985-07-10 Polymatic Investment Corporation N.V. Cutting device and method for the precision trimming of the edge of a cast lens
AU568874B2 (en) * 1983-09-19 1988-01-14 Allergan, Inc. Precision trimming of edge of lens
US5345984A (en) * 1993-12-10 1994-09-13 Ardesson William A Pin router apparatus
US20120207561A1 (en) * 2011-02-14 2012-08-16 Samsung Electronics Co., Ltd. Router apparatus
US9056377B2 (en) * 2011-02-14 2015-06-16 Samsung Electronics Co., Ltd. Router apparatus
US20120325061A1 (en) * 2011-06-24 2012-12-27 Hon Hai Precision Industry Co., Ltd. Machining device
US11358250B2 (en) * 2016-07-08 2022-06-14 Kojima Engineering Co., Ltd. Spherical lens surface processing method and spherical lens surface processing apparatus with cup-shaped grinding stone

Also Published As

Publication number Publication date
FR1495995A (fr) 1967-09-22
DE1629476A1 (de) 1971-01-28
GB1150754A (en) 1969-04-30
NL145165B (nl) 1975-03-17
DE1629476B2 (de) 1976-04-29
NL6614146A (de) 1967-04-10

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